1 Herbaceous plant with aromatic pungent leaves used in perfumes and cooking (6)4 Constellation between Lyra and Corona Borealis (8)8 Jack the ---, infamous criminal (6)9 Unsegmented worms (8)10 Martin ---, US film director (8)11 Town in France and the 24-hour endurance race held there (2,4)12 English county; gymnastic feat (8)13 Fancy ice-cream (6)15 Sucking fish (6)18 Oliver ---, Lord Protector of the Commonwealth, 1653-8 (8)20 Aromatic spice Myristica fragrans (6)21 Roman name for York (8)23 Secured or as good as secured (2,3,3)24 China clay (6)25 In music, to pass from one key to another (8)26 A clockwork model of the solar system (6)

Down

1 Egyptian deity, son of Isis and Osiris (5)2 Batman, for example or 3d or 4ac (9)3 In Greek mythology, killer of Medusa (boo, hiss!) (7)4 14th and 15th century German merchant's guild of cities (9,6)5 Remus's twin (7)6 Jules ---, 19th century French trapeze artist (7)7 Cornish market town (2,7)12 Silver-white metallic element named from place in Scotland it was discovered in 1790 (9)14 Blair`s party? (3,6)16 Underwent biological or genetic change (7)17 Branch of Mathematics dealing with the unknown? (7)19 Powerful man in his tribe in Things Fall Apart by Chinua Achebe (7)22 Nickname of Field Marshal at Alamein (5)